try something like this :

Code:
break on

$form = createobject("kixtart.form")

$lblPath = $form.Label("Path:",10,10,60,15)
$txtPath = $form.TextBox("",10,$lblPath.Bottom,200,20)

$btnBrws           = $form.ToolButton("Browse...",$txtPath.Right+5,$lblPath.Bottom,60,21)
$btnBrws.FlatStyle = 1
$btnBrws.OnClick   = "btnBrws_Click()"

$form.Show

while $form.Visible
    $_ = execute($form.DoEvents)
loop

function btnBrws_Click()
    dim $f
    $f            = $Form.Dialogs.FolderBrowserDialog
    $f.Rootfolder = 17
    if $f.ShowDialog = 1
        $txtPath.Text = $f.SelectedPath
    endif
endfunction


instead of updating a variable you can also refering to $txtPath.Text every time the path is needed
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