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.