Custom Control C# .NET Windows Mobile 5

I need a custom control created to be used with .NET Windows Mobile 5. This custom control should be a ComboBox with multiple select function. In other words i need to be able to select more than one item at a time on a ComboBox for .NET compact framework. I need the follwing methords implemented Add( Adds one element to the list) Remove (removes one element from the list at index x) GetSelected (returns an array of strings) RemoveSelected (removes all the selected elements from the list) This should be pretty simple to implement. I could do it myself but i am short in time. Full payment upon successfull deployment.