Createtoolwindow2 returns null

If the created window is a child window, its default position is at the bottom of the Z-order. If the created window is a top-level window, its default position is at the top of the Z-order but beneath all topmost windows unless the created window is itself topmost.

For information on controlling whether the Taskbar displays a button for the created window, see Managing Taskbar Buttons. For information on removing a window, see the DestroyWindow function. The following predefined system classes can be specified in the lpClassName parameter.

Note the corresponding control styles you can use in the dwStyle parameter. For a table of the button styles you can specify in the dwStyle parameter, see Button Styles. For more information, see Combo Boxes.

For a table of the combo box styles you can specify in the dwStyle parameter, see Combo Box Styles. For a table of the edit control styles you can specify in the dwStyle parameter, see Edit Control Styles. For a table of the list box styles you can specify in the dwStyle parameter, see List Box Styles.

For more information, see Multiple Document Interface. For a table of the rich edit control styles you can specify in the dwStyle parameter, see Rich Edit Control Styles. For a table of the scroll bar control styles you can specify in the dwStyle parameter, see Scroll Bar Control Styles. For a table of the static control styles you can specify in the dwStyle parameter, see Static Control Styles.

CreateWindow is implemented as a call to the CreateWindowEx function, as shown below. For an example, see Using Window Classes. The winuser. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes. About the Multiple Document Interface.

Common Control Window Classes. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode.

CreateWindowW macro winuser. Please rate your experience Yes No. Any additional feedback? Note The winuser. In this article. Designates a small rectangular child window that represents a button the user can click to turn it on or off. Button controls can be used alone or in groups, and they can either be labeled or appear without text. Button controls typically change appearance when the user clicks them.

Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. Visual Studio Integrate. Sign in to vote. Sunday, May 9, PM. Hi SteveRichter, Sorry for the delay. If you have any feedback, please tell us. Tuesday, May 18, AM. If you attempt to set visibility states of the new tool window — such as height, width, or position — before the tool window is visible, you get an error.

Make sure that the window is visible before attempting to set any such properties. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? Creates a new tool window and hosts a user-defined,. NET control in it.