parent fix

Author: Vipul-Cariappa

src/core/toga/style/applicator.py

@@ -7,7 +7,7 @@ def __init__(self, widget):
     def set_bounds(self):
         # print("LAYOUT", self.widget, self.widget.layout)
         self.widget._impl.set_bounds(
-            self.widget.layout.absolute_content_left, self.widget.layout.absolute_content_top,
+            self.widget.layout.content_left, self.widget.layout.content_top,
             self.widget.layout.content_width, self.widget.layout.content_height
         )
         for child in self.widget.children:

src/winforms/toga_winforms/widgets/base.py

@@ -29,7 +29,7 @@ def container(self, container):
             self.native.BringToFront()
 
         for child in self.interface.children:
-            child._impl.container = container
+            child._impl.container = self
 
         self.rehint()
 

src/winforms/toga_winforms/window.py

@@ -90,15 +90,16 @@ def set_content(self, widget):
             self.native.Controls.Add(self.toolbar_native)
             # Create the lookup table of menu items,
             # then force the creation of the menus.
-        self.native.Controls.Add(widget.native)
 
         # Set the widget's viewport to be based on the window's content.
         widget.viewport = WinFormsViewport(native=self.native, frame=self)
         widget.frame = self
 
-        # Add all children to the content widget.
-        for child in widget.interface.children:
-            child._impl.container = widget
+        # Setting widget's container or parent
+        widget.container = self
+
+        # Expanding the widget to occupy empty space of window
+        widget.native.Dock = WinForms.DockStyle.Fill
 
     def set_title(self, title):
         self.native.Text = title