Events from User Control to Parent form ?

[Martin Brading]

I have created an enhanced combo box (user control) which is placed on a form.

 

Any events that are common to both the usercontrol and combobox (in usercontrol) such as "_Validated" fire ok both in the usercontrol itself and the form which the user control sits.

 

However, the "_dropdown" event (which is only within the combobox itself and not by default a standard event in the user control) fires ok in the user control BUT DOESN'T fire in the Form, even though that form has a "_dropdown" event.

 

Any reason why ? I'm sure this is 101 stuff, but I can't find the issue.

Edited April 9, 2004 by Martin Brading

[mooman_fl]

However' date=' the "_dropdown" event (which is only within the combobox itself and not by default a standard event in the user control) fires ok in the user control BUT DOESN'T fire in the Form, even though that form has a "_dropdown" event.[/quote']

Show some code. How do you have the event declared in the usercontrol? Is the event declared as public?

[DiverDan]

Did you remember to include MyBase.OnDropDown(e) in the user control's Protected Overrides Sub OnDropDown event?

 

as an example...

   'adjust dropdown width to largest item width
   Protected Overrides Sub OnDropDown(ByVal e As System.EventArgs)
       MyBase.OnDropDown(e)

       Dim i As Integer
       Dim itemSize As Drawing.SizeF

       If Me.Items.Count >= 1 Then
           Dim g As Graphics = Me.CreateGraphics
           For i = 0 To Me.Items.Count - 1
               itemSize = g.MeasureString(Me.Items.Item(i).ToString, Me.Font)
               If itemSize.Width > Me.DropDownWidth Then
                   Me.DropDownWidth = itemSize.Width
               End If
           Next
           g.Dispose()
       End If
   End Sub