pcsoft.us.windevCopyright 2026, PC SOFT27 Feb 2015 07:00:00 Z27 Feb 2015 07:00:00 ZHi I have 2 internal windows, essentially consisting of table controls. When I created the internal window control I specified IW1 as the default window, and I use ChangeSourceWindow to IW2 depending on a selection in a combo box. My problem is that IW1 works perfectly but, whilst the window changes correctly to IW2 as soon as I click anywhere on that window I get a Visual C++ Runtime error "Application requested the runtime to terminate in an unusual way" & the whole thing crashes. The odd thing though is that if I tab into the window it works perfectly. If I change the default window to IW2 that works OK but then ChangeSourceCode to IW1 gives me the same error. I have several procedures in the windows & I have made sure the names & parameters are identical in each one. One window declares a structure which I duplicated in the other, just in case that was the problem but no luck. I've tried deleting CPL etc but still no good. Any ideas? Thanks David Found it - I just needed to check which internal window was current before attempting to change it. The code for ChangeSourceWindow was being called a second time when it was getting the focus by mouse click. If it was already the current window it would crash. David30WEBDEVen_UShttps://forum.pcsoft.fr/es-ES/pcsoft.us.windev/50710-wd17-internal-windows-solved/read.awpmoderateur@pcsoft.fr (El moderador)webmaster@pcsoft.fr (El webmaster)