Function Update on Boolean Property

Question

Is there a way to use the update function when group properties are used? Am I not registering it correctly? I need to keep unique properties attached to each newly added object however. It seems that if I use the standard update on the pointer for the group functions, it doesn't maintain unique settings for each object.

import bpy
from bpy.props import *

# ---
# Group Properties that include Float, Integer, and String
# ---

class MyPropertyGroup(bpy.types.PropertyGroup):
    custom_String = bpy.props.StringProperty(name ="My String")
# Update Function for Boolean
    custom_Boolean = bpy.props.BoolProperty(update = UpdatedFunction)

# ---
# Layout
# ---

class LayoutPanel(bpy.types.Panel):
    bl_label = "Test Text"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOLS"
    bl_context = "mesh_edit"

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

        row = layout.row(align=True)
        col = row.column()
        col.prop(scn.my_prop_grp, 'custom_String', text="")
        col.prop(scn.my_prop_grp, 'custom_Boolean', text="")

def UpdatedFunction(self, context):
    pass
    return

# ---
# Registers
# ---

def register():
    bpy.utils.register_class(MyPropertyGroup)
    bpy.utils.register_class(LayoutPanel)
    bpy.types.Object.my_prop_grp = bpy.props.PointerProperty(type=MyPropertyGroup)

def unregister():

    bpy.utils.unregister_module(__name__)


if __name__ == "__main__":
    register()

Answer 1

Your update function is not defined before you try to use it. You need to put it before the property group class.

Here is a simple add-on that is very similar to your original:

bl_info = {
    "name": "Addon",
    "author": "Your Name Here",
    "version": (1, 0),
    "blender": (2, 75, 0),
    "location": "View3D > Tools > Test Text",
    "description": "Description",
    "warning": "",
    "wiki_url": "",
    "category": "Temp",
    }

import bpy
from bpy.props import StringProperty, BoolProperty
from bpy.types import PropertyGroup, Panel, Scene
from bpy.utils import register_class, unregister_class


def UpdatedFunction(self, context):
    print("In update func...")
    return


class MyPropertyGroup(PropertyGroup):
    custom_String = StringProperty(name ="My String")
    custom_Boolean = BoolProperty(update = UpdatedFunction)


class LayoutPanel(Panel):
    bl_label = "Test Text"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOLS"
    bl_category = "Tools"  # puts it in the tools tab of 3D view tools
    #bl_context = "mesh_edit"

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

        row = layout.row(align=True)
        col = row.column()
        col.prop(scene.my_prop_grp, 'custom_String', text="")
        col.prop(scene.my_prop_grp, 'custom_Boolean', text="")


classes = (MyPropertyGroup, LayoutPanel)

def register():
    for i in classes:
        register_class(i)

    # storing property in scene for this example
    Scene.my_prop_grp = bpy.props.PointerProperty(type=MyPropertyGroup)


def unregister():
    for i in classes:
        unregister_class(i)


if __name__ == "__main__":
    register()

I think you should be able to find your way from there, but let me know if you need further clarification.

Edit:

bl_info = {
    "name": "Addon",
    "author": "Your Name Here",
    "version": (1, 0),
    "blender": (2, 75, 0),
    "location": "View3D > Tools > Test Text",
    "description": "Description",
    "warning": "",
    "wiki_url": "",
    "category": "Temp",
    }

import bpy
from bpy.props import StringProperty, BoolProperty, PointerProperty
from bpy.types import PropertyGroup, Panel, Scene
from bpy.utils import register_class, unregister_class


def UpdatedFunction(self, context):
    print("In update func...")
    print(self.custom_String)


class MyPropertyGroup(PropertyGroup):
    custom_String = StringProperty(name ="String Property")
    custom_Boolean = BoolProperty(name="Bool Property", update=UpdatedFunction)


class LayoutPanel(Panel):
    bl_label = "Test Text"
    bl_space_type = "VIEW_3D"
    bl_region_type = "TOOLS"
    bl_category = "Tools"  # puts it in the tools tab of 3D view tools
    #bl_context = "mesh_edit"

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

        row = layout.row(align=True)
        col = row.column()
        col.prop(scene.my_prop, 'custom_String', text="")
        col.prop(scene.my_prop, 'custom_Boolean', text="")

        col.prop(scene.my_other_prop, 'custom_String', text="")
        col.prop(scene.my_other_prop, 'custom_Boolean', text="")


classes = (MyPropertyGroup, LayoutPanel)

def register():
    for i in classes:
        register_class(i)

    # storing property in scene for this example
    Scene.my_prop = PointerProperty(type=MyPropertyGroup)
    Scene.my_other_prop = PointerProperty(type=MyPropertyGroup)


def unregister():
    for i in classes:
        unregister_class(i)


if __name__ == "__main__":
    register()