Copy graphics from figure to UIAxes

Hello, I create a plot on a UIAxes with many plots and text objects. I wanted to be able to save them and later on add additional data so I have managed tconvert all the graphics objects on my UIAxes to a figure using the following:

    ax=app.UIAxes;
    xlab=ax.XLabel; ylab=ax.YLabel; 
    yl=ax.YLim;
    h = findobj(ax,'Type','line');
    h1 = findobj(ax,'Type','text');
    h2=findobj(ax);    
    fig=figure;
    set(gcf,'color',[0.25,0.25,0.25]);
    ax = axes;    
    new_handle = copyobj(h,ax);  new_handle = copyobj(h1,ax);
    grid(ax,'on');
    ax.YLim=yl;
    ax.XLabel=xlab;    ax.YLabel=ylab; 
    

I am then able to save this fig.

However, after re-opening this saved fig and trying to get the graphics objects from the figure to the UIAxes is where I am struggling.

I have tried:

   ax=app.UIAxes;      
    %Get  directory where data is
    try
        [file,folder]=uigetfile({'*.fig'},'Open Fig file',app.startfolder);
        app.startfolder=folder;
    catch
        [file,folder]=uigettfile({'*.fig'},'Open Fig file','C:\');
    end    
    openpath=fullfile(folder,file);
    h=openfig(openpath);
    ax=axes(h);
    drawnow;
    %f=gcf
    %copyobj(h.Children, app.UIAxes)
    %newax = copyobj(h,ax);
    newax = copyobj(ax,app.UIAxes);   %from, to
    

But get the error:

    Error using copyobj
    Axes cannot be a child of UIAxes.

Answer 1

[Jason]

Done it, had to get the children of the axes on the figure!

    h=openfig(openpath);
    Ax=h.Children
    g=Ax.Children
    %ax=axes(h);
    n=numel(g)
    hold(ax,'on');
    for i=1:n                
        T=g(i).Type
         newax = copyobj(g(i),app.UIAxes);
    end     
    drawnow;
    

But one last question, can I get the graphics objects from the saved .fig wihtout actually opening it? (and then having to close it)