Unable to use GUI while a process is running.

I've written a program to where you enter a URL of a file to download.
When downloads the file and displays the progress with the Gauge widget
and displays the download speed. When the file is being downloaded I am
unable to use any buttons or type any text in the window. One the
download is complete the program responds the way it should. How do you
place the download process in the background and still have the progress
and speed still displayed? I may be in a brain lock, but I can not
figure it out.
 
import urllib2, sre, sys, time, urllib
from PythonCard import model
 
class Main(model.Background):
 
    global timer
    global speed
    timer = 0
    speed = ''
 
    def on_initialize(self, event):
        self.components.progressBar.value = timer
        self.components.speedField.text = speed
 
    def on_progressBar_timer(self, event, timer):
        self.components.progressBar.value = timer
        
    def on_getBtn_mouseClick(self,event):
        file_url = self.components.fileURLInput.text
 
        lastUpdate = 0.0
        progressSize = 0
        
        def reportHook(count, blocksize, totalsize):
            global lastUpdate
            global progressSize
            global timer
            global speed

            if count == 0:
                lastUpdate = time.time()
                progressSize = 0
                return

            progressSize += blocksize
            deltaTime = time.time() - lastUpdate

            if deltaTime > .1:
                percent = int(float(count * blocksize * 100) /
totalsize)
                speed = int(progressSize / (1024 * deltaTime))
                timer = int(percent)
                speed = str(speed)
                speed = speed + ' kbs'
                self.components.progressBar.value = int(timer)
                self.components.speedField.text = str(speed)
                lastUpdate = time.time()
                progressSize = 0
 
        def getName(file_url):
            # Get file name from URL
            farray = file_url.split('/')
            flen = len(farray)
            flen = flen - 1
            return farray[flen]
        
        def dlFile(file_url, file_name):
            urllib.urlretrieve(file_url,file_name,reportHook)
            print 'Done'
            timer = 0
            speed = ''
            self.components.progressBar.value = timer
            self.components.speedField.text = speed
            
        def mainDL(file_url):
            file_name = getName(file_url)
            dlFile(file_url,file_name)
            
        mainDL(file_url)
        
    def on_exitBtn_mouseClick(self, event):
        sys.exit(0)

if __name__ == '__main__':
    app = model.Application(Main)
    app.MainLoop()

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