PowerShell Studio 2016 : enable OK button if $texbox is not empty

Dear All,

I cannot figure out how to enable the OK button when entering a string in $loginnametextbox. it stay disable.

Here is my code :

$loginametextbox.Text = $null

$formEnableUsersForm_Load={
	#TODO: Initialize Form Controls here
	$buttonOK.Enabled = $false
}

$buttonOK_Click={
	#TODO: Place custom script here
	$buttonOK.Enabled = $false
	
	$loginametextbox.Text= {
		$CheckInput	
	}
	
	If ($CheckInput.text.trim() )
	{
		$buttonOK.Enabled = $true
	}
	
}

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