I am in the process of developing a plugin for QGIS using Python. Note that this is my first plugin, so the query could be quite basic...

I have used this Digital Geography link to create the basic plugin, and (quite surprisingly found it easy) created the plugin files.

I am stuck at a very basic concept. Previously, while using Python IDLE, using

QtCore.QObject.connect(self.Input, QtCore.SIGNAL("clicked()"), self.OpenBrowse)

to signal a click and writing a function OpenBrowse

    def OpenBrowse(self):
        self.Input_TB.setText(filename1)

I was able to open the Windows File Browse window on click and set the File location to an adjoining text box.

How do I do this while developing the plugin in the Python file that is created by Plugin Builder.? I am very confused about where should the code be written? Because if I place the 'clicked()' actions, etc. in the Python file generated from the UI file, it is not recognizing the variables as they are not global (obviously).

I am using QGIS 2.4, on a Windows 32-bit system.