I'm not sure what I did either. To solve it, I compiled the combo base class into it's own DLL. I then added to the toolbox in my combotree project, and all is well. It was all in the same project before.


>>I create a combo class as follows. When I drop it onto a user control and compile I get the error
>>"The type name '_ComboBase' does not exist in the type 'ComboTree.ComboTree'".
>
>Not sure where "ComboTree.ComboTree" comes from ... is the second ComboTree the name of your user control that you're dropping this on? did the _ComboBase class compile ok? Maybe that's where your error actually is ... did you need to add a reference to another project? So many possible reasons for this error to appear ...
>
>~~Bonnie
>
>
>
>>
>>
>>
>>

>>namespace ComboTree
>>{
>>    public class _ComboBase : ComboBox
>>    {
>>        // Event to handle when the down arrow is clicked
>>        public event EventHandler ArrowClicked;
>>
>>        //
>>        protected virtual void OnArrowClicked(EventArgs e)
>>        {
>>            if (this.ArrowClicked != null)
>>            {
>>                this.ArrowClicked(this, e);
>>            }
>>        }
>>
>>        // Overwrite the WndProc event to
>>        protected override void WndProc(ref System.Windows.Forms.Message m)
>>        {
>>
>>            if (m.Msg == 0x201 || m.Msg == 0x203)  //WM_LBUTTONDOWN or WM_LBUTTONDBLCLK
>>            {
>>                // Raise the event
>>                this.OnArrowClicked(new EventArgs());
>>
>>                // Pevent the list from opening
>>                return;
>>
>>            }
>>            base.WndProc(ref m);
>>        }
>>    }
>>}
>>