# HMI DropDown
The drop down can be used as a part of a HMI tab or as the main control for selecting the tabs. If you use it as a main control for selecting the tabs only one Tab can be opened at once*.* The value of a PLCInputInt is set according to the selected menu element (from 0 to n). Within the HMI-Demo-scene it is used to switch in between camera views. To use it with the render mode "Worldspace" you need the HMI-PanelWorldSpace as parent.
## Properties
* `Color Elements`: background color of the dropdown elements when inactive
* `Color Selected`: background color of the selected (currently active) dropwodn element
* `Menue Title`: title of the menue
* `Title Font Size`: font size of the title
* `DropDown Elements`: List of drop down elements as strings
* `Start Mode`: mode/ menue item which is active when the game mode start
* `SignalSelectedElement`: PLCInputInt - Value of the selected Dropdown element
* `SignalSetElement`: PLCOutputInt - Value to set the selected element from PLC side.
* `Duration`: duration in second how long the drop down appears
* Activate On Mouse Enter: activates the dropdown when the mouse pointer enter
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://doc.realvirtual.io/components-and-scripts/scene-interaction/hmi-components-pro/hmi-dropdown.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.