<telerik:RadTextBox ID="rtbUserName" runat="server" Width="98%" ShouldResetWidthInPixels="false"></telerik:RadTextBox>$('input[id$=rtbUserName_text]').val("Test");


<telerik:RadTabStrip ID="tabRawReliable" runat="server" Skin="Simple" MultiPageID="RadMultiPage1" SelectedIndex="0"> <Tabs> <telerik:RadTab text="Tab1" Value="View" Font-Bold="true" PageViewID="PageView1"/> <telerik:RadTab text="Tab2" Value="Edit" PageViewID="RadPageView2"/> </Tabs></telerik:RadTabStrip> <telerik:RadMultiPage ID="RadMultiPage1" runat="server"> <telerik:RadPageView ID="PageView1" runat="server" > <asp:TextBox id ="txt1" runat="server"/> <asp:ImageButton ID="imgAddNew" runat="server" /> </telerik:RadPageView> <telerik:RadPageView ID="RadPageView2" runat="server"> <asp:TextBox id ="txt1" runat="server"/> <asp:TextBox id ="txt2" runat="server"/> <asp:TextBox id ="txt3" runat="server"/> <asp:TextBox id ="txt4" runat="server"/> <asp:Button ID="Submit" runat="server" /> </telerik:RadPageView> </telerik:RadMultiPage> 
<asp:Panel ID="Pan_dataAdditionalContactInformation" runat="server" Width="410" Height="32" ScrollBars="None"><asp:TextBox runat="server" ID="dataAdditionalContactInformation" Text='<%# Bind("AdditionalContactInformation") %>' TextMode="MultiLine" MaxLength="200" Width="420" ToolTip="Example; Any morning between 10 11am except Wednesday or Saturday" /></asp:Panel>
<ajaxToolkit:ResizableControlExtender ID="rce_dataAdditionalContactInformation" runat="server" TargetControlID="Pan_dataAdditionalContactInformation" ResizableCssClass="resizingText" HandleCssClass="handleText" MinimumWidth="420" MinimumHeight="32" MaximumWidth="420" MaximumHeight="250" HandleOffsetX="5" HandleOffsetY="5" OnClientResizing="ResizeTextBox" />
function
ResizeTextBox(sender, eventargs) {
var element = sender.get_element();
element.children[2].style.height = element.style.height;
element.children[2].style.width = element.style.width;
return false;
}
I changed the TextBox to a RadTextBox and use the ResizeRadTextBox function:-
function ResizeRadTextBox(sender, eventargs) {
var element = sender.get_element();
element.children[2].children[0].style.height = element.style.height;
element.children[2].children[0].style.width = element.style.width;
return false;
}

<
asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="RadScheduler1">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="RadScheduler1" LoadingPanelID="RadAjaxLoadingPanel1" />
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
<telerik:RadAjaxLoadingPanel ID="radAjaxLoadingPanel1" runat="server" EnableEmbeddedSkins="false" />
<div style="width: 743px; height: 560px; background: transparent url('Images/background.png') no-repeat 0 0;
padding-top: 34px; padding-left: 7px;">
<div style="color: #000; font: 14px 'Segoe UI', Arial, sans-serif; position: static;
top: 5px; padding-left: 5px;">
My Schedule
</div>
<telerik:RadSplitter ID="radSplitter1" runat="server" PanesBorderSize="0" Skin="Web20"
Width="750" Height="500" Style="border: solid red 1px;">
<telerik:RadPane ID="leftPane" runat="server" Width="240px" MinWidth="240" MaxWidth="300"
Scrolling="None">
<div style="width: 220px; margin: 7px auto;">
<telerik:RadCalendar runat="server" ID="RadCalendar1" Skin="Web20" OnSelectionChanged="radCalendar1_SelectionChanged"
AutoPostBack="true" EnableMultiSelect="false" DayNameFormat="FirstTwoLetters"
OnDefaultViewChanged="radCalendar1_DefaultViewChanged" EnableNavigation="true"
EnableMonthYearFastNavigation="false">
</telerik:RadCalendar>
<telerik:RadCalendar ID="RadCalendar2" runat="server" Skin="Web20" OnSelectionChanged="radCalendar2_SelectionChanged"
AutoPostBack="true" EnableMultiSelect="false" DayNameFormat="FirstTwoLetters"
EnableNavigation="true" EnableMonthYearFastNavigation="false">
</telerik:RadCalendar>
</div>
</telerik:RadPane>
<telerik:RadSplitBar runat="server" ID="RadSplitBar2" CollapseMode="Forward" />
<telerik:RadPane runat="Server" ID="rightPane" Scrolling="None" Width="500px">
<telerik:RadScheduler runat="server" ID="RadScheduler1" Height="500px" Skin="Web20" CustomAttributeNames="StartTime,EndTime,SessionDate"
ShowViewTabs="true" ShowHeader="true" ShowFooter="true" SelectedDate="2010-07-11"
DataStartField="StartTime" DataEndField="EndTime" EnableDescriptionField="true"
DayStartTime="08:00:00" AllowInsert="false" AllowEdit="false" AllowDelete="false" ReadOnly="false"
DayEndTime="21:00:00" FirstDayOfWeek="Monday" DataKeyField="SessionId" DataSubjectField="SessionDate" Columns="1"
LastDayOfWeek="Friday" EnableEmbeddedSkins="false" OnNavigationComplete="radScheduler1_NavigationComplete">
<AdvancedForm Modal="true" />
<AppointmentTemplate >
<div style="text-align: left; margin: 0 0 3px; font-size: 11px; font-weight: bold;
color: #369; height: 17px; border-bottom: 1px solid #8bf; width: 100%;">
<asp:Label runat="server" Text='<%# Eval("StartTime")%>' ID="RecurrenceIcon" />
<asp:Label runat="server" Text='<%# Eval("EndTime")%>' ID="Label1" />
</div>
</AppointmentTemplate>
<ResourceTypes>
<telerik:ResourceType KeyField="ID" Name="SessionDate" TextField="SessionDate" ForeignKeyField="SessionDate" />
</ResourceTypes>
</telerik:RadScheduler>
</telerik:RadPane>
</telerik:RadSplitter>
</div>
</
asp:Content>
