From 35fd92cb9366ebd42e92a3ac2cb5e6e187d1493d Mon Sep 17 00:00:00 2001
From: paul <paul@lazarus-ide.org>
Date: Thu, 15 Apr 2010 22:10:28 +0000
Subject: [PATCH] ideintf: don't use canvas of ValueComboBox while handle is
 not assigned (fixes bug #0016246)

git-svn-id: trunk@24636 -
---
 ideintf/objectinspector.pp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ideintf/objectinspector.pp b/ideintf/objectinspector.pp
index 335ccf1108..ffc934e49d 100644
--- a/ideintf/objectinspector.pp
+++ b/ideintf/objectinspector.pp
@@ -1468,7 +1468,7 @@ procedure TOICustomPropertyGrid.ValueComboBoxMeasureItem(Control: TWinControl;
 var
   CurRow: TOIPropertyGridRow;
 begin
-  if (FItemIndex >= 0) and (FItemIndex < FRows.Count) then
+  if (FItemIndex >= 0) and (FItemIndex < FRows.Count) and (ValueComboBox.HandleAllocated) then
   begin
     CurRow := Rows[FItemIndex];
     CurRow.Editor.ListMeasureHeight('Fj', Index, ValueComboBox.Canvas, AHeight);