PowerShell Pro Tools multiple forms not running as expected - visual-studio

Question

I am using PowerShell Pro Tools to create a GUI application that consists of all the common scripts I would run on a clients server:
main.ps1
main.ps1 loads a ServerConnection form on load:
The code behind this is pretty basic, it just gets the database name and server address for an SQL server:
$btnConfirm_Click = {
$ServerConnectForm.Close();
}
$btnTest_Click = {
## Set database connection variables [global]
$Global:databaseName = $cmbDatabaseName.Text;
$Global:serverAddress = $txtServerAddress.Text;
## Check db connection
$testResult = Invoke-SqlCmd -serverInstance $serverAddress -Database $databaseName -Query "SELECT TOP 1 SettingName FROM Settings";
## Write results to user
if ( $testResult -ne $null ) {
$lblTestResult.ForeColor = "#2acc18";
$lblTestResult.Text = "Test connection successfull";
<# If test connection success enable confirm button #>
$btnConfirm.Enabled = $true;
}
else {
$lblTestResult.ForeColor = "#d61111";
$lblTestResult.Text = "Test connection failed";
}
}
$txtServerAddress_Leave = {
## Get TRIS database list
$databaseList = Invoke-Sqlcmd -ServerInstance $txtServerAddress.Text -Query "
SELECT name FROM sys.databases WHERE CASE WHEN state_desc = 'ONLINE' THEN OBJECT_ID(QUOTENAME(name) + '.[dbo].[settings]', 'U') END IS NOT NULL
"
## Clear combo box
$cmbDatabaseName.Items.Clear();
## Add to combo box
foreach ($database in $databaseList) {
$cmbDatabaseName.Items.Add($database.ItemArray[0]);
}
}
. (Join-Path $PSScriptRoot 'main.designer.ps1')
$MainForm.ShowDialog()
The problem is that when I either compile this into an executable or run main.ps1 directly from the project folder, none of the code outside of main.ps1 works. The form will show up but I cannot find a way to get the code behind the form to work. For example in the ServerConnection form, adding a server address does not populate the database names and the test connection button does nothing.
Running from within Visual Studio works as intended.
Any help on this would be greatly appreciated.
EDIT :: Show the server connection form call in main.ps1
MainForm_Load
$MainForm_Load = {
## Launch server connection form
. (Join-Path $PSScriptRoot 'ServerConnect.designer.ps1');
$ServerConnectForm.ShowDialog();
## Call prereq analysis
PrereqAnalysis
}

Answer 1

It might be an issue with the scoping of your code.
If code outside the current scope of a session depends on said session, it will not work.
You could try setting the scope of variables and functions to global while you troubleshoot to see if it makes a difference, then change it back until you find where the scope goes wrong.
Microsoft have a good MSDoc page about Powershell scopes