Hi, Jan -
The following code in the "Find" button will display the (nested) tabpage containing dw_3:
tab_1.SelectTab(2)
tab_1.tabpage_2.tab_3.SelectTab(3)
If you are asking how to programatically examine/search thru tab_1's tabpages and any nested tab controls and tabpages within tab_1's tab pages, you have to recursively examine the array of userobjects named "control[]" which is a property of each tab control and each tabpage user object, using the TypeOf() function on each array element until you find a userobject of type DataWindow! whose name is dw_3.
I suggest you start by examining tab_1's Control[] array of userobjects. Use UpperBound(Tab_1.Control[]) to determine how many tab pages tab_1 contains. Then use the TypeOf() function on each element of this array to obtain the enumerated object type (tab pages have a TypeOf() of UserObject!).
Once you can do this, you then examine the Control[] array of each tabpage, looking for userobjects that have a TypeOf() of Tab! (this will be a nested tab control contained on the tab page) or a TypeOf() of DataWindow!. If/when you find a (nested) tab control, examine the user objects (tabpages) in its Control[] array, and so on until you find the DataWindow named dw_3.
HTH, John