Fixes nullable bool error with cast.

UICatalog/Scenarios/BordersOnContainers.cs

@@ -262,7 +262,7 @@ namespace UICatalog.Scenarios {
 			};
 			cbDrawMarginFrame.Toggled += (e) => {
 				try {
-					smartView.Border.DrawMarginFrame = cbDrawMarginFrame.Checked;
+					smartView.Border.DrawMarginFrame = (bool)cbDrawMarginFrame.Checked;
 					if (cbDrawMarginFrame.Checked != smartView.Border.DrawMarginFrame) {
 						cbDrawMarginFrame.Checked = smartView.Border.DrawMarginFrame;
 					}
@@ -338,7 +338,7 @@ namespace UICatalog.Scenarios {
 			cbEffect3D.Toggled += (e) => {
 				try {
 					smartView.Border.Effect3D = effect3DOffsetX.Enabled =
-						effect3DOffsetY.Enabled = cbEffect3D.Checked;
+						effect3DOffsetY.Enabled = (bool)cbEffect3D.Checked;
 				} catch { }
 			};