BUG: Copying the Tab Control Does Not Display All Child Controls

CAUSE

The SSTab control keeps an internal list of child controls on each tab. It also keeps a count of the child controls on each tab. If Form1 is saved and then examined in a text editor, such as Notepad, the number of controls on Tab 0 is 0 instead of 1.

The SSTab control builds a list of information about the controls contained on it, including the name of each of the controls. When the SSTab control is copied, its persisted data contains this array of control information. When the new tabctl is created by a Paste operation, the persisted data from the first control is used. The problem is that the controls that are created by Visual Basic with the second SSTab have different names than those in the persisted data: Command2 becomes Command3, and so forth. So when the SSTab tries to rebuild the controls dispid's array, it cannot find any matching names. Therefore, if the SSTab is pasted onto a different form that does not contain controls with the same names as its child controls, they all appear normal.