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mt4 dialog box panel is not a bug, create a simple dialog box, compile on mt5 everything is fine, mt4 once switch cycle panel will change the wrong, the same code comes out different results

Calling the system gui library and creating a simple dialog program initializes fine on mt4, but once the chart cycle is switched several times, it will be wrong, while on mt5 there is no such problem, everything is fine The code and images are in the attachment