# Design Time

To start using **RadMultiColumnComboBox** just drag it from the toolbox and drop it at the form.

## Smart Tag

Select **RadMultiColumnComboBox** and click the small arrow on the top right position in order to open the **Smart Tag**. The **Smart Tag** for **RadMultiColumnComboBox** lets you quickly access common tasks involved with building **RadMultiColumnComboBox** elements and customizing appearance through themes.

> caption Figure 1: Smart Tag

![WinForms RadMultiColumnComboBox Smart Tag](https://www.telerik.com/products/winforms/documentation/assets/4858d834ce2fb81b4cf758d2bac4c415/multicolumncombobox-design-time001.png)

* **New Theme Manager**: adds a new **RadThemeManager** component to the form.

* **Edit UI Elements**: allows setting properties at multiple levels of the class hierarchy.

> caption Figure 2: Element Hierarchy Editor

![WinForms RadMultiColumnComboBox Element Hierarchy Editor](https://www.telerik.com/products/winforms/documentation/assets/abfe522e132b9caa86fb7c92122886f9/multicolumncombobox-design-time002.png)

* **Theme Name**: select a theme name from the drop down list of themes available for that control. Selecting a theme allows you to change all aspects of the control's visual style at one time.

* **DataSource**: allows binding **RadMultiColumnComboBox** at design time.

* **Open Property Builder**: allows quickly creating and arranging node structure and appearance.

  ![WinForms RadMultiColumnComboBox GridView Property Builder](https://www.telerik.com/products/winforms/documentation/assets/ea00cc221517c1f24f2314906b661c64/multicolumncombobox-design-time003.png)

* **Learning Center**: Navigate to the Telerik help, code library projects or support forum.

* **Search**: Search the Telerik site for a given string.

## Data Binding

You can bind **RadMultiColumnComboBox** at design time by specifying the **DataSource**, **ValueMember** and **DisplayMember** properties. Additional information can be found on the following link: [Data binding at design time](https://www.telerik.com/products/winforms/documentation/controls/multicolumncombobox/populating-with-data/databinding).

## See Also

* [Element Hierarchy Editor](https://www.telerik.com/products/winforms/documentation/tools/element-hierarchy-editor)

* [Using default themes](https://www.telerik.com/products/winforms/documentation/styling-and-appearance/using-default-themes)