Hi Yaniv,

May I know what do you mean with dynamic page? do you mean the pane is created programaticaly? 
So far I test with simple sample I didn't get any problem with splitter. The pane can be expanded and collapsed as normally. 

I have attached simple sample to you PaneWithHebrewHeader.zip. It show webpane created programaticaly and use Hebrew text in Pane header. Please let me know if you have different scenario.

Hope this helps.

I'm sorry for the inconvenience caused. The link has been updated. Please try to download the link. And let me know your response about the sample.

srry for the late replay ur sample works but we use diffrent code so..

here is the code that we use to build the webpane with hebrew

aspx=

<ISWebDesktop:WebPaneManager ID="WebPaneManager1" runat="server" EnableManagedTheming="True">
<ImagesSettings SplitterGripBottom="splitterbottom.gif" SplitterGripLeft="spiltterleft.gif"
SplitterGripRight="splitterright.gif" SplitterGripTop="splittertop.gif" />
<RootGroupPane Text="Root GroupPane" Name="RootGroupPane" AllowCollapse="Yes" AllowResize="Yes">
<Panes>
<ISWebDesktop:WebGroupPane Text="GroupPane Content" Name="koby" AllowCollapse="Yes" AllowResize="Yes">
</ISWebDesktop:WebGroupPane>
<ISWebDesktop:WebGroupPane Text="GroupPane Content" Name="avi" AllowCollapse="Yes" AllowResize="Yes">
</ISWebDesktop:WebGroupPane>
</Panes>
</RootGroupPane>
</ISWebDesktop:WebPaneManager>

cs=

protected void Page_Load(object sender, EventArgs e)
{
Orchestrate.initGeneralData();
DataTable dtPageParameters = Orchestrate.GetRecords(GeneralManagement.GetStoredProcedure(GeneralManagement.appStoredProcedure.sp_mul_get_main_page_parameters), 1).Tables[0];
MultyScreen multyScreen = Orchestrate.initMultyScreen(dtPageParameters);
WebGroupPane wgpUpper = (WebGroupPane)WebPaneManager1.RootGroupPane.Panes[0];
wgpUpper.GroupType = GroupPaneType.VerticalTile;
WebPane[] wp = new WebPane[dtPageParameters.Rows.Count];
WebGroupPane wgpLower = (WebGroupPane)WebPaneManager1.RootGroupPane.Panes[1];
wgpLower.GroupType = GroupPaneType.VerticalTile;
multyScreen.SotrScreensByScreenOrder();

for (int i = 0; i < dtPageParameters.Rows.Count; i++)
{
WebPane wpTemp = new WebPane();
wp[i] = wpTemp;
wp[i].ContentURL = multyScreen.Screens[i].ScreenURL;
wp[i].ContentMode = ISNet.WebUI.WebDesktop.ContentMode.UseIFrame;
wp[i].Width = DimensionMode.Fill;
wp[i].Height = DimensionMode.Fill;
//wp[i].Image = @"\Images\borderbkg.png";
wp[i].TextAlignment = TextAlignment.Center;
wp[i].Text = multyScreen.Screens[i].Name;

if ((dtPageParameters.Rows.Count/2) > i)
wgpUpper.Panes.Add(wp[i]);
else
wgpLower.Panes.Add(wp[i]);

The discussion moved to the following link:

http://www.intersoftpt.com/Community/WebDesktop/splitter-problem-webpanemanager-and-hebrew/