You can fix size of the outside form, but when i resize inside application (eg. Word Office window) then the outside form is also changed despite it being fixed.

But i'm loading another application (word office, eg.) into that form. So, when i resize the "inside" application, it also resizes the outside form too despite you fixing size of the outside form. I suppose that we must use some API functions to solve but i don't know exactly.

I load another application into winform and i want it not to resize. So i must use API to control. I think i can't use FormBorderStyle or FixedToolWindow. :)

I use API following to disable minimize, maximize box in windows. But i can't do that with restore button. I'm quite confused.

SetWindowLong(hwnd, GWL_STYLE,0x16CC0000);

0x16CC0000: remove maximize, minimize box. But i can't find the other code for restore box.