如何在WPF中使用TabControl添加不同选项卡上的按钮

I have the basic tabs made and I want each tab to have a different set of buttons, but the button is added to the main window and no the tab. When i go to the code and cut the button and paste it to the tab I want it to be, it works but only for 1 button, then for the second button I get an error message:I have the basic tabs made and I want each tab