Each of the controls included in the Telerik UI for ASP.NET AJAX suite is styled with two CSS files that are loaded in a certain order. The first one - ControlName.css , also called base stylesheet contains CSS properties and values that are common for all skins, i.e it is layout-specific, not skin-specific. These are CSS float, padding, margin, font-size, font-family, etc. In the general case, when creating a custom skin for a control this file should not be edited, unless the custom skin needs different sizes, padding and/ or margins.
The second file represents the actual skin of the control, and its name consists of the control name plus the skin name, i.e - FormDecorator.Default.css. Upon creating a custom skin for the control, one should edit that particular file, as it contains skin-specific CSS properties, and references to images, colors, borders and backgrounds.
In order to explain better the CSS classes of RadToolTip, we will use ToolTip.SkinName.css as external resources. We will modify an existing skin of RadToolTip. Follow these steps to register an external skin for RadToolTip for ASP.NET AJAX before editing any CSS:
In your project, create a new directory named Skins
In the Skins folder create a new directory MyCustomSkin.
Go to ~/[TelerikControlsInstallationFolder]/Skins/Default and copy FormDecorator.Default.css and the Skins/Default/FormDecorator folder in your Skins folder.
Rename FormDecorator.Default.css to FormDecorator.MyCustomSkin.css and the folder Default to MyCustomSkin.
When you are finished you should have Skins/MyCustomSkin/FormDecorator.MyCustomSkin.css and Skins/MyCustomSkin/FormDecorator. The last folder contains the images for MyCustomSkin.
In order to support multiple skins of RadFormDecorator on a single page, the wrapping skin-specific class is coined by the name of the control, RadFormDecorator plus underscore ("
_") plus SkinName, i.e. .RadFormDecorator_Default, so in order to create a custom skin out of the Default skin, we should rename all occurrences of "Default" in FormDecorator.MyCustomSkin.css to "MyCustomSkin" as shown below:
Add a new server declaration of RadFormDecorator on your page, and set Skin="MyCustomSkin" and EnableEmbeddedSkins="false":
<telerik:RadFormDecorator RenderMode="Lightweight" ID="rfd1" runat="server" DecoratedControls="All" EnableEmbeddedSkins="false" Skin="MyCustomSkin" />
Register FormDecorator.MyCustomSkin.css in the
<head>...</head>section of your webpage. In order to have the CSS applied correctly, the base stylesheet should come first in the DOM:
<link href="Skins/MyCustomSkin/FormDecorator.MyCustomSkin.css" rel="stylesheet" type="text/css" />
Make sure the path to the files is correct, otherwise the skin will not apply.
Reload the page, and if the steps 1-9 have been followed correctly, you will see RadFormDecorator running a custom Default skin set as an external resource.
Each skin of RadFormDecorator consists of several image sprites contained in the Skins/SkinName/FormDecorator folder:
ButtonSprites.gif contains buttons and scrollbar arrows
CheckBoxSprites.gif contains all checkbox states
RadioButtonSprites.png contains all radio button states
RadioButtonSprites.gif contains all radio button states for IE6
ComboSprites.gif contains the dropdown/select states
FieldsetBgr.png contains the fieldset background
Explained below is a simple method for modifying the image sprites of RadFormDecorator with Adobe© PhotoShop to achieve new looks without creating a new design.
Drag ButtonSprites.gif in Adobe© PhotoShop.
From the menu bar select Image » Mode » RGB Color to prepare the images for editing (convert from optimized Indexed Color to RGB Color):
Press Set Foreground Color in PhotoShop's toolbox to invoke the color picker dialog:
Select a color that you like from the color dialog and then close it:
Choose the image you will modify - ButtonSprites.gif, and select Image » Adjustments » Hue/Saturation to open the Hue/Saturation dialogof Adobe© PhotoShop:
Check the colorize checkbox in the Hue / Saturation dialog, and the image you have selected will be immediately colorized in the hue you have selected from the toolbox:
You may then play with the Hue, Saturation and Lightness sliders to fine tune or further modify the image.
Press "OK" when you are finished
Select Image Image » Mode » Indexed Color to flatten the layers of the image
Save and close the image
Once you are ready, save your work and reload the page. You will have a brand new skin based on Telerik's Default skin of RadFormDecorator.