The C1Tabs control's tab pages follow a zero-based index, meaning that the index of the first tab page is zero. By default, the Selected property will be set to zero ("0"), and the first tab will be selected at run-time. To change which tab and tab page is selected at run-time, set the Selected property to a different number in the index. For example, if you have four tabs and want the last one to be selected at run-time, you would set the Selected property to 3.