How to use Qgis ComboManger inside my plugin?

[المشرف العام]

Could someone provide some detailed instructions (for very new beginners!!) on how to integrate combomanager in another plugin?

What I have tried (maybe wrong way of doing it!!...):
First I downloaded Qgis Combo Manager from [http://3nids.github.io/qgiscombomanager/] and extracted the zip folder.

Then I copiedcomposercombo.py, expressionfieldcombo.py, fieldcombo.py, layercombo.py and optiondictionary.py in my class directory.Then I included in the import section of my module' s python filethe following:

from qgis.core import *from layercombo import VectorLayerCombo, LayerCombofrom fieldcombo import FieldCombofrom expressionfieldcombo import ExpressionFieldComboFinally, under run(self)

line186 def run(self)line187 self.dlg.comboBox = VectorLayerCombo(self.dlg.comboBox)line188 self.dlg.comboBox_2 = FieldCombo(self.dlg.comboBox_2, self.dlg.comboBox)So when I run my plugin for the first time it works. Then, if I run it again just after the first time I get this error message:


Traceback (most recent call last):
File "C:/Users/Eleftheria/.qgis2/python/plugins\MyClass\my_module.py",
line 188, in run
self.dlg.comboBox = VectorLayerCombo(self.dlg.comboBox)
File "C:/Users/Eleftheria/.qgis2/python/plugins\MyClass\layercombo.py",
line 187, in init
LayerCombo.init(self, widget, initLayer, options, QgsMapLayer.VectorLayer) File "C:/Users/Eleftheria/.qgis2/python/plugins\MyClass\layercombo.py",
line 62, in init
self.widget.currentIndexChanged.connect(self.__currentIndexChanged)
AttributeError: 'VectorLayerCombo' object has no attribute 'currentIndexChanged'
Python

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