You can add ToolButton->SharedProps->Shortcut (eg: F8)
then, in the code:
 

SendKeys.Send("{F8}");

What I can understand from your code is that from one part of your code you need to activate a functionality that you don't have access to.

Instead of clicking a ButtonTool, I think you should make that functionality public, so you can invoke it from other libraries.

For me, having to mimic a click on a UI control to invoke something looks like a bad design.

Emanuel

PS: Here is the initial code I posted in this thread, modified for the situation I described above:

Library 1:

The class (Class1) where you are adding the button tool to toolbar:

private void OnToolbarManagerToolClick(object sender, ToolClickEventArgs e)
{
    switch (e.Tool.Key) 
    {
        case "ToolKey1": 
            Class2.Action1(); 
    } 
} 

The class (Class2) that contains the functionality you seek:
public void Action1()
{
    // specific code to complete the selected operation 
}

From you main application, when you need to invoke the same functionality as the click on the button tool:

...

Class2.Action1();

...

In the code above I've used Class2 and should be treated as an instance call or as a static call, depending on your situation.

It isn't possible. The button tools are dinamically created in a dll from a configuration file. Each user chooses the menu to emulate from button.

I solved in this (terrible) way:

tlbTool = Me.Tools(sTool)
With DirectCast(tlbTool, ButtonTool)
                        Dim aAppearanceData As Infragistics.Win.AppearanceData = Nothing
                        With .SharedProps.ToolInstances(0)
                            .ResolveAppearance(aAppearanceData, Infragistics.Win.AppearancePropFlags.BackColor)
                            Dim srt As Shortcut = .SharedProps.Shortcut
                            .SharedProps.Shortcut = Shortcut.Ctrl0
                            SendKeys.Send("^0")
                            Application.DoEvents()
                            .SharedProps.Shortcut = srt
                            .SharedProps.AppearancesSmall.AppearanceOnMenu.BackColor = aAppearanceData.BackColor
                        End With
                        aAppearanceData = Nothing
                    End With