The CellButtonClick event is fired after the user has released the left mouse button over a cell of button type.  Use the CellHasButton property to specify whether a cell is of button type. The CellButtonClick event notifies your application that user presses a cell of button type. 

The following VB sample sets the cells of the first column to be of button type, and displays a message when one of them has been clicked.

Private Sub Gantt1_AddItem(ByVal Item As EXGANTTLibCtl.HITEM)
    Gantt1.Items.CellHasButton(Item, 0) = True
End Sub

Private Sub Gantt1_CellButtonClick(ByVal Item As EXGANTTLibCtl.HITEM, ByVal ColIndex As Long)
    MsgBox "The cell of button type has been clicked"
End Sub

The following VB.NET sample displays a message when the user clicks a button in the cell:

Private Sub AxGantt1_CellButtonClick(ByVal sender As Object, ByVal e As AxEXGANTTLib._IGanttEvents_CellButtonClickEvent) Handles AxGantt1.CellButtonClick
    MsgBox("The cell of button type has been clicked")
End Sub

The following C# sample displays a message when the user clicks a button in the cell:

private void axGantt1_CellButtonClick(object sender, AxEXGANTTLib._IGanttEvents_CellButtonClickEvent e)
{
	MessageBox.Show("The cell of button type has been clicked");
}

The following C++ sample displays a message when the user clicks a button in the cell:

void OnCellButtonClickGantt1(long Item, long ColIndex) 
{
	MessageBox( "The cell of button type has been clicked." );
}

The following VFP sample displays a message when the user clicks a button in the cell:

*** ActiveX Control Event ***
LPARAMETERS item, colindex

wait window "The cell of button type has been clicked."