<Button Command="Copy">
                    <Button.ToolTip>
                        <ToolTip Background="#0F0F0F">
                            <StackPanel>
                                <TextBlock />

                            </StackPanel>
                        </ToolTip>
                    </Button.ToolTip>

            </Button>



CommandBindings.Add(new CommandBinding(ApplicationCommands.Copy, OnCopy, CanCutOrCopy));

TextAreaDefaultInputHandler.WorkaroundWPFMemoryLeak(InputBindings);


<ContextMenu }" >
                                    <MenuItem Header="{l:Localization Key=Copy}"  Click="Copy" >
                                    </MenuItem>
                                </ContextMenu>