# Graphical Panel Controls: Tx Button

The Tx Button control allows you to send a transmit message from a graphical panel.

![Figure 1: An example Tx Button control.](/files/99heQCVpogq2KULQIN0q)

Table 1 lists the properties specific to a Tx button, which appear in addition to the common properties found under [Common Control Properties](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-measurement/graphical-panels/graphical-panels-tools/graphical-panel-controls-common-control-properties.md).

**Table 1: Tx Button Control Properties**

| Property        | Function and Options                                                                                                                                                                                                                 |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| OnText          | The text shown when the button is pressed or held down (**On** state).                                                                                                                                                               |
| OffText         | The text shown by default, when the button is up (**Off** state).                                                                                                                                                                    |
| TxType          | <p>The action that should be taken when button is pressed:</p><ul><li><strong>0-Tx button:</strong> Sends the message once.</li><li><strong>1-Periodic On/Off Button:</strong> Sends the message at the set periodic rate.</li></ul> |
| TransmitMessage | Click this field to select the message to send when the button is pressed.                                                                                                                                                           |


---

# 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://docs.intrepidcs.com/vspy-3-documentation/vehicle-spy-main-menus/main-menu-measurement/graphical-panels/graphical-panels-tools/graphical-panel-controls-tx-button.md?ask=<question>
```

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.