[Bf-python] combobox

[Yuniel Castro González]

Hi to all.
How can I do a panel with a combobox?

class example(bpy.types.Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'TOOLS'
    bl_label = "ABC"

    def draw(self, context):
        ?????????


Thanks in advance.

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Yuniel