How to create a C# Winforms Control that hovers

Using windowsform: How to create a C# Winforms Control that hovers on newest questions tagged winforms – Stack Overflow

How can you create a C# Winforms control which goes out of the bounds of its region? Such as a drop down box. Kind of like if you had a DropDownBox in a Small Sized Panel.

source: http://stackoverflow.com/questions/353561/how-to-create-a-c-sharp-winforms-control-that-hovers
Using windowsform: using-windowsform