Introduction - If you have any usage issues, please Google them yourself
Winform Forms Designer, based on the C# source code to achieve, the interface of VisualStudio, the Form Designer shows production form an essential element of the attribute information, although fewer features than the VS, but to write such a function, but also need some level, the source code is compiled. Masked control container, Overlayer operation of the container (as well as the child controls), set the Z-axis on the bottom of the other controls can not accept user input, accept all user actions. You can comment this try, the bottom of the other controls (form) will be able to accept mouse clicks, the filter control container WM_PAINT message of all its child controls reduce the redraw operation.