void InitSystemEditor()
{
_systemEditor = new frmSystemEditor();
_systemEditor.SelectionChanged += systemEditor_SelectionChanged;
_systemEditor.FileOpen += systemEditor_FileOpen;
_systemEditor.DataManipulated += systemEditor_DataManipulated;
}
void CloseSystemEditor()
{
//dispose system editor
_systemEditor.Dispose();
_systemEditor = null;
}