[MonoDevelop] Adding new file to project disappears in next restart

[True Friend]

Hi
Looks it is a bug, when I add a new file in MD (version 1 on Kubuntu Hardy)
it accepts and adds it to solution but on next restart when same solution is
opened there is no such file in solution I can see in left hand sidebar
titles "Solution" and also the complier denies the existence of any such
file (or the class in the file) and display this error
[Task:File=/home/ss/testGtk/testGtk/gtk-gui/MainWindow.cs, Line=24,
Column=17, Type=Error, Priority=Normal, Description=The type or namespace
name `UTextView' could not be found. Are you missing a using directive or an
assembly reference?(CS0246)]
Is it a bug?
Regards

-- 
Muhammad Shakir Aziz محمد شاکر عزیز
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