mbColorLib: Fix painting issues of TmbTrackbarPicker-descendents in Linux (did not paint at all).

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@5550 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/mbColorLib/examples/fulldemo/main.lfm

@@ -43,9 +43,9 @@ object Form1: TForm1
     Height = 384
     Top = 6
     Width = 403
-    ActivePage = TabSheet3
+    ActivePage = TabSheet9
     Anchors = [akTop, akLeft, akRight, akBottom]
-    TabIndex = 2
+    TabIndex = 9
     TabOrder = 0
     OnChange = PageControl1Change
     OnMouseMove = PageControl1MouseMove
@@ -721,8 +721,8 @@ object Form1: TForm1
         TabOrder = 2
         Hue = 0
         Saturation = 0
-        Luminance = 78
-        SelectedColor = 5131854
+        Luminance = 73
+        SelectedColor = 4802889
       end
       object VColorPicker1: TVColorPicker
         Left = 34
@@ -897,6 +897,7 @@ object Form1: TForm1
         Width = 22
         HintFormat = 'Magenta: %m (selected)'
         ArrowPlacement = spBefore
+        Anchors = [akTop, akLeft, akBottom]
         TabOrder = 1
         SelectedColor = clFuchsia
       end
@@ -907,6 +908,7 @@ object Form1: TForm1
         Width = 31
         HintFormat = 'Yellow: %y (selected)'
         ArrowPlacement = spBoth
+        Anchors = [akTop, akLeft, akBottom]
         TabOrder = 2
         SelectedColor = clYellow
       end
@@ -917,6 +919,7 @@ object Form1: TForm1
         Width = 22
         HintFormat = 'Black: %k (selected)'
         NewArrowStyle = True
+        Anchors = [akTop, akLeft, akBottom]
         TabOrder = 3
         Cyan = 0
         Black = 1
@@ -930,6 +933,7 @@ object Form1: TForm1
         HintFormat = 'Red: %r (selected)'
         ArrowPlacement = spBefore
         NewArrowStyle = True
+        Anchors = [akTop, akLeft, akBottom]
         TabOrder = 4
         Green = 122
         Blue = 122
@@ -943,6 +947,7 @@ object Form1: TForm1
         HintFormat = 'Green: %g (selected)'
         ArrowPlacement = spBoth
         NewArrowStyle = True
+        Anchors = [akTop, akLeft, akBottom]
         TabOrder = 5
         Red = 122
         Blue = 122
@@ -955,6 +960,7 @@ object Form1: TForm1
         Width = 22
         HintFormat = 'Blue: %b (selected)'
         SelectionIndicator = siRect
+        Anchors = [akTop, akLeft, akBottom]
         TabOrder = 6
         Green = 122
         Red = 122