Actually I think that was the difference... I did do the rebuild all instead of just a build. Again, thanks.

>No prb Richard I work with vb.net and never had that prb, that usually happens when you change something on your base class and then don't rebuild the project, but usuallt doing a rebuild all fix this.
>>I got it... somehow... Thanks for your help.
>>
>>Richard
>>
>>>and is defined as public or internal the base class?
>>>
>>>>In the same project/assembly. So, check.
>>>>
>>>>Richard
>>>>
>>>>
>>>>>Richard is the base form located on the same project as this form or in another one?
>>>>>if on diferent project/assembly make sure the form is defined as public instead of internal or private.
>>>>>
>>>>>>I'm trying to subclass a Form and add a virtual function to it for use with a toolbar/Save menuitem in an MDI Parent window. I'm getting the following warning:
>>>>>>
>>>>>>

>>>>>>The designer could not be shown for this file because none of the classes within it can be designed.  The designer inspected the following classes in the file:
>>>>>>
>>>>>>	frmHoldTransactions --- The base class 'DCF.ReconSys.Forms.ReconSysMDIChildFormBase' could not be loaded.  Ensure the assembly has been referenced and that all projects have been built.
>>>>>>

>>>>>>
>>>>>>The assembly was built. I'm guessing I need to add some sort of Designer attributes to my subclass in order to use it in the form designer. Any suggestions for a newbie?
>>>>>>
>>>>>>Thanks
>>>>>>
>>>>>>Richard