<TelerikDockManager Height="100vh" OnStateChanged="OnStateChanged" OnStateInit="OnStateInit" @ref="dockManager">
        <DockManagerPanes>
            <DockManagerSplitPane>
                <Panes>
                    <DockManagerContentPane Closeable="false" Maximizable="true" HeaderText="Content1 header" @bind-Size="Content1PaneSize">
                        <Content>
                            <div>
                                yada yada 
                            </div>
                        </Content>
                    </DockManagerContentPane>
                    <DockManagerSplitPane Orientation="DockManagerPaneOrientation.Vertical">
                        <Panes>
                            <DockManagerContentPane Maximizable="false" Closeable="false" @bind-Size="Content2PaneSize">
                                <HeaderTemplate>
                                    <span>content 2 header gets erased</span>
                                </HeaderTemplate>
                                <Content>
                                    <div>
                                        Content 2
                                    </div>
                                </Content>
                            </DockManagerContentPane>
                            <DockManagerContentPane HeaderText="header 3" Closeable="false" @bind-Size="Content3PaneSize">
                                <Content>
                                    <div>
                                        content 3
                                    </div>
                                </Content>
                            </DockManagerContentPane>
                        </Panes>
                    </DockManagerSplitPane>
                </Panes>
            </DockManagerSplitPane>
        </DockManagerPanes>
    </TelerikDockManager>