"Show Tooltip when moving mouse over expresion" option is not working

 I'm using SharpDevelop as a control in my application (based on SharpSnippet example) and I want to add toolTips display (on mouse over) in textEditor.

Question 1 - Is there a way to activate the tooltip text support for TextEditor ? (I saw an option for this in the BufferOption dialog but enabling this option change nothing.(Option=Show Tooltip when moving mouse over expresion)

Question 2  In order to add tooltip support I try to "Merge" the SharpSnippetCompiler example with the CSharpCodeCompletion example but I'm not sure it's the right way to do this since all parsing and code completion stuffs are already automatically managed by SharpDevelop core itself. (except for tooltip for some obscur reason)  What is the point of interrest of the CSharpCodeCompletion example? Custom code completion?

Thanks,