You can set the window type in the painter and save the window. It can be opened with OpenSheet just like a regular window with the difference that resizing it to zero will also hide the titlebar.



Define creating at runtime, please. How are you doing this and why would you need to import this window back into a library? Is this a window that you create just for this purpose or a regular window you just want to make invisible in some cases? What are you using this invisible window for? This might be a XY problem where the solution you ask about might not be viable for the problem at hand.

Ok i will explain, the app i am working on has more than 500 windows and all of them except for rows search windows (response windows) are main windows. Main windows are opened from menu as MDI sheets. This is the most common way everybody handle windows.



Now, thing to note is that i am writing code in the parent window that has no parent. That also means all my sheets are inherited from the lets say w_parent.

2nd important thing is that i dont want to open every inherited sheet and manually change its type in design mode to something other than Main.



Now, last option to change type at runtime is to do LibraryExport/Import and when syntax is in variable i change type and then Import the window back into a temp library. This will not happen in PB because LibraryImport function takes only DataWindow! as parameter. Window or any other object cannot be imported into Library.



Certainly changing type of window seems too much of work to me. I would do one thing next and that is the reason to find why TypeOf() always fail when height/width of sheet is not bigger enough like 600 or more.



HTH

May be CREATE is alternate way to change type of a window but side effects are too many if i do it.

Alright, just checked it and PB help says

"To create an instance of a visual user object or window, use the appropriate Open function (instead of CREATE)."