[IronPython] WPF Combo Box

WPF Combo Box

import clr
clr.AddReference("PresentationFramework")
clr.AddReference("PresentationCore");
clr.AddReference('System.Data')
clr.AddReference('System.Windows.Forms')

import System
from System import *
from System.Data import *
from System.Type import GetType
from System.Threading.Tasks import Task
from System.Windows import *
from System.Windows.Controls import *
from System.Windows.Controls.Primitives import *
from System.Windows.Media import *
from System.Windows.Media.Imaging import *
from System.Windows.Media.Effects import *
from System.Windows.Shapes import Rectangle
from System.Windows.Data import Binding
from System.Windows.Ink import Stroke
from System.Windows.Forms import ( FolderBrowserDialog, DialogResult )
from Microsoft.Win32 import ( OpenFileDialog, SaveFileDialog )

import ctrl

class WpfCombo(ctrl.WpfCtrl):
    def __init__(self,handler=None,items=None,selected=0,**kwargs):
        self.ctrl = ComboBox()
        self.ctrl.IsEditable=True
        self.ctrl.IsReadOnly=False        
        self.init(**kwargs)
        if handler: self.ctrl.SelectionChanged += handler
        if items:
            self.ctrl.ItemsSource = items
            self.ctrl.SelectedIndex = selected     
    def get_value(self): return ctrl.Text
    def get_added_item(self,args): return args.AddedItems[0]

choice_ctrl = None

if __name__ == "__main__":
    def combo_handler(s,e):
        if len(e.AddedItems) > 0:
            print( e.AddedItems[0] )
    def button_handler(s,e):print( choice_ctrl.ctrl.Text )
    import win
    app = win.Win("Button Demo",320,240)
    choice_ctrl = WpfCombo(items=("1st","2nd","3rd"),selected=0, handler=combo_handler)
    app.set_content(choice_ctrl.ctrl)
    b = Button(); b.Content = "Button"; b.Click += button_handler
    app.add_statusbar(b)
    app.run()