# Adding New Property in Theme Tree

This topic covers adding new property in theme tree.

## Content

A new property can be inserted at a specific position in the Theme tree via the **Add** command button from the **Edit** group in the C1Theme Designer Ribbon menu.

To add a new property in the Theme Tree, complete the following:

1. Open the C1Theme designer and create a new theme based from any of the office themes such as **Office2010Blue**.
2. Select the **Styles** under the **BaseThemeProperties**.
3. Click **Below** from the **Add** dropdown menu in the **Edit** group.

![add-new-property](https://cdn.mescius.io/document-site-files/images/1204f627-5ed0-4459-b7d2-b00ca20a218e/documentgraphics/addnewproperty.png)

The **Add Property** dialog box appears:
![](https://cdn.mescius.io/document-site-files/images/1204f627-5ed0-4459-b7d2-b00ca20a218e/images/add-property-dialog.png)

4. Enter Emptybackground in the **Name** textbox.
5. Select Background from the **Type** dropdown listbox.
6. In the **Description** richtextbox enter "Background for empty window areas".
7. Click **OK** in the **Add Property** dialog box.

The new property, Empty Background, appears below the Styles property in the BaseThemeProperties Theme Tree.
![new-property](https://cdn.mescius.io/document-site-files/images/1204f627-5ed0-4459-b7d2-b00ca20a218e/documentgraphics/newpropertyemptybackground.png)