Introduction - If you have any usage issues, please Google them yourself
C# source code to hide the toolbar on the left of the window a small window, by default, open the Toolbox window is hidden, you can only see a vertical bar, mouse over the vertical line above the toolbar on the launching, and expanded Toolbar with Close button, the user can always turn it off when not needed. Implementation process overview: Get control and form a handle, get the current mouse under visual control handle to obtain the specified handle parent handle, get the current mouse under visual control handle, home storage handle variables, record the original handle, traverse the handle parent handle, get the current mouse under visual control handle to return the bottom of the handle of the parent