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I did add a new element (button) on window form via GUI designer, but in code I don't have access to it in Qt application. Qt Creator IDE show error and tell me, what no such element in UI of application, when I try to use it in code by object name. Why it happens?

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Possible, database of application UI elements in IDE don't update yet. For deciding this problem, clear and rebuild project/solution. This almost always helps in similar cases.

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