focus

Create a UI figure with a label, drop-down component, and two buttons. Make the OK button the default button by giving it keyboard focus. The user can push the button by pressing Enter or the space bar.

fig = uifigure(Position=[500 500 300 100]);
gl = uigridlayout(fig,[2 2]);

lbl = uilabel(gl,Text="Select a color:");
dd = uidropdown(gl,Items=["Red" "Green" "Blue"]);
btn1 = uibutton(gl,Text="OK");
btn2 = uibutton(gl,Text="Cancel");

focus(btn1)

Create a new script file in your current folder. In the script, create a UI figure and a grid layout manager with two rows. Add a button to the first row, and specify that the app executes a callback function named createTextArea when a user pushes the button. Give keyboard focus to the button.

fig = uifigure(Position=[500 500 300 200]);
gl = uigridlayout(fig);
gl.RowHeight = ["1x" "3x"];
gl.ColumnWidth = "1x";

btn = uibutton(gl,Text="Enter Comment", ...
    ButtonPushedFcn=@createTextArea);
focus(btn)

Define the createTextArea function at the bottom of the file. In the function, create a text area in the second row of the grid layout manager. Then, give keyboard focus to the text area.

function createTextArea(src,event)
gl = src.Parent;
ta = uitextarea(gl);
focus(ta)
end

Run the script. Press Enter to execute the ButtonPushedFcn callback, and the text area appears with keyboard focus. You can then type in the text area.