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.NET Forum / Windows Forms / WinForm Controls / June 2008Can't derive from System.Windows.Forms.TreeView
Hi, I'd like to create a specialized version of System.Windows.Forms.TreeView. But creating a class and deriving from TreeView doesn't work. I can't drag this new class onto a Form or store it in the Toolbox. What am I doing wrong here? How can I derive from TreeView and have all the Visual Studio Designer features? TIA, Axel Dahmen >Hi, > [quoted text clipped - 4 lines] >TIA, >Axel Dahmen Create a new UserControl class. Change the inheritance from UserControl to TreeView (if using VS2005 or later this is in the .designer file). You will have to comment out or remove one line in the generated code that will give an error once you change the class. Hi Axel, You can create your own TreeView easily, but it may not always pop up in the ToolBox, especially if you have lot of third party controls already in the ToolBox. Make sure Tools->Windows Forms Designer->General->Autopopulate ToolBox is set to true (remember to restart the solution if you change the setting). If you still have problems seeing the control (PS! controls should be in the toolbox in a group called "<project> components") you may have to add a regular TreeView and change the class in the designer.cs file. Its a bit unclear what you mean by "I can't drag this new class onto a Form or store it in the Toolbox." Can you elaborate?  SignatureHappy Coding! Morten Wennevik [C# MVP] > Hi, > [quoted text clipped - 7 lines] > TIA, > Axel Dahmen Thanks, Jack and Morten! Going through your tips I've found the reason why it didn't work yesterday. I forgot to declare my class as "public".... I found your tips - particularly the "toolbox group called <project> components tip - very valuable. Thanks a lot! And best regards, Axel Dahmen -------------------------------- > Hi Axel, > [quoted text clipped - 22 lines] >> TIA, >> Axel Dahmen Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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