Take 'Mail Folders' or 'Addressbooks' title out of a splitter. It is not needed and messes up the pointer (turns into an arrow for dragging). Allow add a high flex number to the tree. This fixes the persistence for the sidebar height. Bug 26259. r=mcafee

mailnews/addrbook/resources/content/addressbook.xul

@@ -251,11 +251,9 @@ Rights Reserved.
 	<box orient="horizontal" flex="100%" style="min-width:150px">
 		<!-- sidebar with dir tree -->
 		<box id="sidebar-box">
-			<splitter class="sidebarheader-main" collapse="after">
 				<sidebarheader class="sidebarheader-main" value="&addressbook-sidebar-header.label;"/>
-			</splitter>
 			
-			<tree id="dirTree" flex="1"/>
+			<tree id="dirTree" flex="1000"/>
 		</box>
 		<splitter id="sidebar-splitter" collapse="before" persist="state"/>
 		
@@ -281,4 +279,4 @@ Rights Reserved.
 	
 	<box id="taskbar" class="toolbox-bottom"/>
 
-</window>
+</window>

mailnews/base/resources/content/messenger.xul

@@ -326,10 +326,8 @@ Rights Reserved.
 
 	<box align="horizontal" style="height:100px" flex="1">
 		<box id="sidebar-box">
-			<splitter class="sidebarheader-main" collapse="after" persist="state">
+			<sidebarheader class="sidebarheader-main" value="&mail-sidebar-header.label;"/>
-				<sidebarheader class="sidebarheader-main" value="&mail-sidebar-header.label;"/>
+			<tree id="folderTree" flex="1000" context="folderPaneContext" />
-			</splitter>
-			<tree id="folderTree" style="width:100px; height: 600px;" flex="1" context="folderPaneContext"/>
 		</box>
           
 		<splitter id="sidebar-splitter"/>