With the latest version R1 2017 SP1 the image icon of RadButton is not aligned inside a content template of RadPanelbar. See the attached screenshot for more information and test the code: <%@ Page Language="C#" AutoEventWireup="true" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <telerik:RadScriptManager runat="server" ID="sm"></telerik:RadScriptManager> <style> body { font: 12px "segoe ui",arial,sans-serif; } </style> <telerik:RadPanelBar runat="server" ID="RadPanelBar1" Width="100%"> <Items> <telerik:RadPanelItem Text="Filtering and configuration" Expanded="True"> <ContentTemplate> <telerik:RadButton RenderMode="Lightweight" ID="RadButton_HierarchyLoadMode" Width="300px" runat="server" ButtonType="ToggleButton" Checked="true" ToggleType="CheckBox"> <ToggleStates> <telerik:RadButtonToggleState Text="Yes - Each comment will load only when clicked" PrimaryIconCssClass="p-i-checkbox rbToggleCheckbox" /> <telerik:RadButtonToggleState Text="No - All comments will be loaded when the report starts or the datasource is changed." PrimaryIconCssClass="p-i-checkbox-checked rbToggleCheckboxChecked" /> </ToggleStates> </telerik:RadButton> <telerik:RadButton RenderMode="Lightweight" ID="RadButton_SaveGridSettings" runat="server" Text="Save Grid Settings" Width="140px"> <Icon PrimaryIconCssClass="rbSave"></Icon> </telerik:RadButton> </ContentTemplate> </telerik:RadPanelItem> </Items> <ExpandAnimation Type="None" /> <CollapseAnimation Type="None" /> </telerik:RadPanelBar> </form> </body> </html> The problem is not reproducible with the R3 2016 build.