void ribbonPaletteSet_WorkspaceLoaded(object sender, EventArgs e)
{
Autodesk.AutoCAD.Ribbon.RibbonPaletteSet pset = (Autodesk.AutoCAD.Ribbon.RibbonPaletteSet)sender;
Initialize(_applications.First(x => x is Ribbons.ICmdRibbonPane));
pset.WorkspaceLoaded -= ribbonPaletteSet_WorkspaceLoaded;
}