Add throughput cap error message (#1151)

src/Explorer/Panes/PanelFooterComponent.tsx

@@ -3,12 +3,20 @@ import React from "react";
 
 export interface PanelFooterProps {
   buttonLabel: string;
+  isButtonDisabled?: boolean;
 }
 
 export const PanelFooterComponent: React.FunctionComponent<PanelFooterProps> = ({
   buttonLabel,
+  isButtonDisabled,
 }: PanelFooterProps): JSX.Element => (
   <div className="panelFooter">
-    <PrimaryButton type="submit" id="sidePanelOkButton" text={buttonLabel} ariaLabel={buttonLabel} />
+    <PrimaryButton
+      type="submit"
+      id="sidePanelOkButton"
+      text={buttonLabel}
+      ariaLabel={buttonLabel}
+      disabled={!!isButtonDisabled}
+    />
   </div>
 );