How to fix a toolbar missing from the material ui package - material-ui

Please the toolbar is missing in my material ui....I tried using it and it said export 'ToolBar' (imported as 'ToolBar') was not found in '#mui/material' what do should I do please?
I started afresh still no change

It is Toolbar instead of ToolBar.
import Toolbar from "#mui/material";

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I'm using material UI for my React js project and I want to change the outline color of menu. If you know how to do please write down your answer.Thank you....

Material UI component with arrow

Is there a Material UI component that is like a container/box with an arrow coming out of it like tooltips can do? I'll insert a screenshot of what I'm trying to do below. The only way I can think of right now is to just use tooltip and set open to always be true, but i was hoping there was an already built component for this that i just cant find
I am pretty sure MUI doesn't have a component like that. Otherwise you should customize a Paper component, Popper or Box or style a div.

Material-UI download icon

Do you know if material UI has something like download icon. I could not find it by name download or export. Is it really missing or it is just has some other name?
import GetAppIcon from '#material-ui/icons/GetApp';
Here you can search for more material-ui icons

Windowbuilder pro adding custom jpanel

just a simple question: I made a custom jpanel putting in just buttons. How do I put this jpanel into my jframe in design view?
Thanks!
Ok i found out the method of adding custom component to WindowBuilder. Silly me, need to build the class and then right click the palatte to add in custom component :)

GWT DialogBox - setGlassEnabled(true) does not cover the whole window

I set glass enabled to true of a GWT dialog box. However, when the user has scrolled down in the window, then the "glass effect" does not cover the whole window anymore.
Does anyone know how to fix that? Many thanks for any advices!
You need a css property such as
moveToPopUp.setGlassStyleName("myApp-PopupPanel-GlassStyle");
where
.myApp-PopupPanel-GlassStyle{
background-color : #333;
opacity : 0.4;
clip : rect(auto,auto,auto,auto);
}
There is no straight fix available, but you can:
1. Remove scroll when showing popup with addStyleName, removeStyleName
2. There is also other solution, but you have to change layout of your style and will limit your functionality so I do not recommend this. But if you are interested I can describe this.
try
glassPanel.setSize("100%", "100%");
where glassPanel is the name of your panel,
be sure to include the import statement.