I haven't worked a lot with MDI-applications. I have a mainform(MDIFORM). A menuchoise is an aboutbox. When I call the Aboutbox I use this code :
The aboutbox is an MDIChild-Form.
When Closing the aboutbox(Close-button) I use
I works fine to enter/close the aboutbox one time, but when I want to close it the second time, I got the error message :
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