Creating our first button in VBA

Prerequisites

We recommend you go though A 'hello world' VBA program before going into this example.

Creating a button

Enter the code below in a standard VBA module

```
Public Sub CreateMyUI3()
```
```
 
```
```
    Dim myCustomUI As rxCustomUI
```

    Set myCustomUI = rxCustomUI.defaultInstance

```
 
```
```
    With myCustomUI
```
```
        ' Clear old state
```
```
        .Clear
```
```
 
```
```
        ' Add a new tab
```

        With .ribbon.tabs.Add(New rxTab)

```
            .Label = "My First Tab"
```

            ' Add a new group to our tab

            With .groups.Add(New rxGroup)

```
                .Label = "My Group"
```
```
 
```

                ' Add a new button to our group

                With .Buttons.Add(New rxButton)

                    .Label = "My Button"

```
                End With
```
```
 
```
```
            End With
```
```
        End With
```
```
 
```
```
        ' Render the UI
```
```
        .Refresh
```
```
    End With
```
```
 
```
```
End Sub
```

Run the sub to create a button labeled 'My Button' (which belongs to a group labeled 'My Group' which, in turn' belongs to a tab labeled 'My Tab')

Code Analysis I

```
' Add a new group to our tab
```
```
With .groups.Add(New rxGroup)
```
```
    .Label = "My Group"
```
```
    '...
```
```
End With
```

Each rxTab object has a collection of rxGroup objects (accessible through its groups property). Here we add a new group to our tab's groups and label it 'My Group'

```
' Add a new button to our group
```
```
With .Buttons.Add(New rxButton)
```

    .Label = "My Button"

```
End With
```

Each rxGroup object has a collection of rxButton objects (accesible through its buttons property). Here we add a new button to our group's buttons and label it 'My Button'

Adding a handler for the button's onAction delegate

At the moment the new button isn't of much use as it does nothing when clicked. In this section we will hook up to the control's onAction delegate.

Update the sub as follows

```
Public Sub CreateMyUI3()
```
```
 
```
```
    Dim myCustomUI As rxCustomUI
```

    Set myCustomUI = rxCustomUI.defaultInstance

```
 
```
```
    With myCustomUI
```
```
        ' Clear old state
```
```
        .Clear
```
```
 
```
```
        ' Add a new tab
```

        With .ribbon.tabs.Add(New rxTab)

```
            .Label = "My First Tab"
```

            ' Add a new group to our tab

            With .groups.Add(New rxGroup)

```
                .Label = "My Group"
```
```
 
```

                ' Add a new button to our group

                With .Buttons.Add(New rxButton)

                    .Label = "My Button"

                    ' Hook up the control's onAction delegate

                    .onAction = myCustomUI.make_delegate("MyCallback")

```
                End With
```
```
 
```
```
            End With
```
```
        End With
```
```
 
```
```
        ' Render the UI
```
```
        .Refresh
```
```
    End With
```
```
 
```
```
End Sub
```

We have now hooked up the control's onAction delegate with a function called MyCallback, which we haven't yet provided.
We can now either manually provide a delegate stub function with the correct name and signature, or make use of the Ribbon Commander VBA tools to insert it automatically:
1. Right-click inside the callback name string ("MyCallback" here)
2. Follow the path 'Ribbon Commander'->'Insert Delegate Stubs'->'Insert [rxButton.onAction] stub':
3. This will insert an empty stub right below the current function:

Sub MyCallback(ByVal control As RibbonCommander.IRibbonControl)
    Err.Raise &H80004001, , "Not implemented"
End Sub

Run the updated sub (CreateMyUI3).
The delegate stub currently raises and error. Update it to display a message box instead:

Sub MyCallback(ByVal control As RibbonCommander.IRibbonControl)
    MsgBox "Hello, world!"
End Sub

If everything has gone according to plan, clicking the button will now display:

Code Analysis II

```
' Add a new button to our group
```
```
With .Buttons.Add(New rxButton)
```
```
    .Label = "My Button"
```

    ' Hook up the control's onAction delegate

    .onAction = myCustomUI.make_delegate("MyCallback")

```
End With
```

rxButton has a number of delegate properties which allow you to hook up callbacks to events of the control. One of them is onAction which is called when the button is clicked.

In the Ribbon Commander Framework, delegates are of type rxDelegate and are always associated with (and created via) a unique rxCustomUI instance.

Here, we create a new rxDelegate object for a VBA function named 'MyCallback' through our rxCustomUI's make_delegate method and connect the new object with our button (through its onAction property)

We can also write the snippet in a more verbose way:

' Add a new button to our group
With .Buttons.Add(New rxButton)
    .Label = "My Button"
 
    ' Create a new delegate for VBA function 'MyCallback'
    Dim myDelegate As rxDelegate
    Set myDelegate = myCustomUI.make_delegate("MyCallback")
 
    ' Hook up the control's onAction delegate
    .OnAction = myDelegate
End With

Remarks

Complete Example Code

```
Public Sub CreateMyUI3()
```
```
 
```
```
    Dim myCustomUI As rxCustomUI
```

    Set myCustomUI = rxCustomUI.defaultInstance

```
 
```
```
    With myCustomUI
```
```
        ' Clear old state
```
```
        .Clear
```
```
 
```
```
        ' Add a new tab
```

        With .ribbon.tabs.Add(New rxTab)

```
            .Label = "My First Tab"
```

            ' Add a new group to our tab

            With .groups.Add(New rxGroup)

```
                .Label = "My Group"
```
```
 
```

                ' Add a new button to our group

                With .Buttons.Add(New rxButton)

                    .Label = "My Button"

```
 
```

                    ' Hook up the control's onAction delegate

                    .OnAction = myCustomUI.make_delegate("MyCallback")

```
                End With
```
```
 
```
```
            End With
```
```
        End With
```
```
 
```
```
        ' Render the UI
```
```
        .Refresh
```
```
    End With
```
```
 
```
```
End Sub
```
```
 
```
```
 
```

Sub MyCallback(ByVal control As RibbonCommander.IRibbonControl)

```
    MsgBox "Hello, world!"
```
```
End Sub
```

Creating our first button in VBA

Contents

Prerequisites

Creating a button

Code Analysis I

Adding a handler for the button's onAction delegate

Code Analysis II

Remarks

Complete Example Code

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