Please help - I want to send back a keystroke to the ISE window

Hello WPF friends, I need a little help. I want to add a button which sends F7 keystroke to the ISE-window from which I run this little WPK script.

ipmo WPK                        
                        
$env:WPKResult = "auto"                          
New-StackPanel {                        
    New-RadioButton -Content "auto"     -GroupName Results -IsChecked $True -On_Click { $env:WPKResult = "auto" }                        
    New-RadioButton -Content "list"     -GroupName Results -On_Click { $env:WPKResult = "list" }                        
    New-RadioButton -Content "table"    -GroupName Results -On_Click { $env:WPKResult = "table" }            
    New-RadioButton -Content "grid"     -GroupName Results -On_Click { $env:WPKResult = "grid" }            
    New-RadioButton -Content "variable" -GroupName Results -On_Click { $env:WPKResult = "variable" }            
    New-RadioButton -Content "csv"      -GroupName Results -On_Click { $env:WPKResult = "csv" }            
    New-RadioButton -Content "file"     -GroupName Results -On_Click { $env:WPKResult = "file" }            
    New-Button -Content "execute Sql"  -On_click { New-Button "I want to send F7 key-stroke to calling ISE" -show }                        
} -asjob                        
                        

This script is intended to be run in ISE and to add some cool GUI to SQLPSX.

Thanks

Bernd