DynamicProperties.py

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# made in response to
# http://blender.stackexchange.com/q/44014/935

import bpy

bl_info = {
    "version": (1, 0),
    "blender": (2, 75, 0),
    "name": "testing addon",
    "description": """Sample addon to demonstrate displaying a CollectionProperty within a panel""" ,
    "category": "test",
}


class UserItems(bpy.types.PropertyGroup):
    user_str = bpy.props.StringProperty()
    user_int = bpy.props.IntProperty()

class UserAddOptions(bpy.types.Operator):
    """Add a user item"""
    bl_idname = "object.add_user_items"
    bl_label = "Add custom user items"

    def execute(self, context):
        item = bpy.context.scene.user_items.add()
        item.user_int = 5
        item.user_str = 'custom value'
        return{'FINISHED'}

class UserDelOptions(bpy.types.Operator):
    """remove a user item"""
    bl_idname = "object.del_user_item"
    bl_label = "Remove a custom user item"

    del_item = bpy.props.IntProperty(name='item index to remove')

    def execute(self, context):
        context.scene.user_items.remove(self.del_item)
        return{'FINISHED'}

class OptionsPanel(bpy.types.Panel):
    """testing panel in the 3dview properties region"""
    bl_label = 'Optional data Panel'
    bl_idname = 'OBJECT_PT_options'
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_context = 'object'

    def draw(self, context):
        scn = context.scene
        layout = self.layout

        col = layout.column()
        row = col.row()
        row.prop(scn, 'option01')
        row = col.row()
        row.prop(scn, 'option02')

        box = col.box()
        col = box.column()
        row = col.row()
        if scn.show_my_options:
            row.prop(scn, "show_my_options", icon="DOWNARROW_HLT", text="", emboss=False)
        else:
            row.prop(scn, "show_my_options", icon="RIGHTARROW", text="", emboss=False)

        row.label('My options here')

        if scn.show_my_options:
            row = col.row()
            col = row.column(align=True)
            col.prop(scn.render, 'resolution_x', text='X')
            col.prop(scn.render, 'resolution_y', text='Y')
            if scn.option01:
                row = col.row()
                row.label('extra options go here')
                row = col.row()
                row.label('and more rows for other data')

            if scn.option02:
                row = col.row()
                row.label('dynamic options go here')
                row = col.row()
                row.operator(UserAddOptions.bl_idname)
                for idx, item in enumerate(scn.user_items):
                    row = col.row()
                    row.prop(item,'user_str')
                    row.operator(UserDelOptions.bl_idname, text='',
                                icon='X').del_item = idx
                    row = col.row()
                    row.prop(item,'user_int')

def register():
    bpy.utils.register_module(__name__)
    bpy.types.Scene.show_my_options = bpy.props.BoolProperty(name='Show Custom Props', default=False)
    bpy.types.Scene.option01 = bpy.props.BoolProperty(name='First options', default=False)
    bpy.types.Scene.option02 = bpy.props.BoolProperty(name='Dynamic options', default=False)
    bpy.types.Scene.user_items = bpy.props.CollectionProperty(type=UserItems)

def unregister():
    del bpy.types.Scene.show_my_options
    del bpy.types.Scene.option01
    del bpy.types.Scene.option02
    del bpy.types.Scene.user_items
    bpy.utils.unregister_module(__name__)

if __name__ == "__main__":
    register()