tabcontrol - call of the method in mainwindow gives different result when it is called from usercontrol c# -

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in mainwindow try navigate through tabcontrol method 

public void izaberidijagnostiku() {         this.tabcontrol1.selecteditem = tabitem3;         this.tabitem3.focus(); }

and works.

but, when call method user control navigation doesn't work. how can navigate through tabs?


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