First, drag a data grid onto a stack and double click on it to open the Data Grid Helper (DGH) Properties Palette.

Click the "Edit..." button to open Columns Builder.

Click the (+) button and add three columns.

Name the last column "Checkbox".

Open the Classic Objects, Column sBuilder Properties topic (1)

Double click on the "Checkbox" header (2)  to open the Column Content (3)

Next, drag the check box image from the Column Builder Properties and drop it in the Column Content Area (4)

Click the Update button to refresh the Column Builder Preview content (1).

A field named "_ColumnData_" will also be automatically added in the Column Content.

We have no need of that field in this lesson. Remove it by selecting it's name in the Object List of the Column Content Area (2), after the field is selected in the Column Content, on your keyboard, press the Delete or suppr key.

Double clicking on the Checkbox Button in the Column Content, will open the Properties Inspector.

Enter a name for the checkbox. Example: myFirstCheckBox

DGH can now  build the required script for managing this check box according to the column data.

Click the Script Editor icon and select the "Build Script" menu.

Click the "Update" button to update the script of the column.

Click the "Erase" button to replace the column default script with the script built by DGH.

After the script is built update the DataGrid Preview, by clicking the "Update" button.

Then, click on the "Apply" button to apply the modifications to the selected DataGrid (1).

To test the result, open the Contents tab of the LiveCode's Property Inspector, then input some data.

Separate data of each column by a tab, and each line by a return.

Note: The Checkbox will be checked when the checkbox column value is true, and unchecked when false.

Congratulations! You have developed your first custom column in a DataGrid, without entering any script.