FIX: background color of some Buttons (issue #1593)

(cherry picked from commit 69ab554ba5)

src/fMsg.pas

@@ -39,6 +39,7 @@ procedure TfrmMsg.FormCreate(Sender: TObject);
 begin
   Escape:= -1;
   iSelected:= -1;
+  pnlButtons.ParentColor:= true;
 end;
 
 procedure TfrmMsg.FormClose(Sender: TObject; var CloseAction: TCloseAction);

src/fcopymovedlg.lfm

@@ -71,8 +71,6 @@ object frmCopyDlg: TfrmCopyDlg
     AutoSize = True
     BorderSpacing.Top = 8
     BevelOuter = bvNone
-    Color = clForm
-    ParentColor = False
     TabOrder = 1
   end
   object pnlButtons: TPanel
@@ -91,8 +89,6 @@ object frmCopyDlg: TfrmCopyDlg
     BevelOuter = bvNone
     ClientHeight = 36
     ClientWidth = 596
-    Color = clForm
-    ParentColor = False
     TabOrder = 2
     object btnOptions: TButton
       Left = 0

src/fdeletedlg.lfm

@@ -19,6 +19,7 @@ inherited frmDeleteDlg: TfrmDeleteDlg
     Align = alTop
     ClientHeight = 1
     ClientWidth = 399
+    ParentColor = True
     object lblMessage: TLabel[0]
       AnchorSideLeft.Control = pnlContent
       AnchorSideTop.Control = pnlContent
@@ -45,6 +46,7 @@ inherited frmDeleteDlg: TfrmDeleteDlg
     Anchors = [akTop, akLeft, akRight]
     BorderSpacing.Top = 32
     ClientWidth = 399
+    ParentColor = True
     inherited btnCancel: TBitBtn
       Left = 221
     end