You can create a multiline textbox by using the -Multiline parameter. Pressing enter will add a new line. You can define the number of rows and the max number of rows using -Rows and -RowsMax.
New-UDTextbox -Multiline -Rows 4 -RowsMax 10
Interaction
Retrieving a textbox value
You can use Get-UDElement to get the value of a textbox
You can set the icon of a textbox by using the -Icon parameter and the New-UDIcon cmdlet.
New-UDTextbox -Id "ServerGroups" -Icon (New-UDIcon -Icon 'server') -Value "This is my server"
OnEnter
The -OnEnter event handler is executed when the user presses enter in the text field. It is useful for performing other actions, like clicking a button, on enter.