paper-dialog-scrollable isn't scrolling

<ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder'
xmlns:g='urn:import:com.google.gwt.user.client.ui'
xmlns:p='urn:import:com.vaadin.polymer.paper.widget'>

<div class="server horizontal center-justified layout">
<style>
.serverName {
padding-left: 20px;
font-size: 150%;
font-weight: normal;
}
.serverLeft {
}
.serverCenter {
width: 100%;
}
.serverRight {
}
.serverSpan {
display: inline-block;
width: 100%;
--shadow-elevation-16dp;
}
</style>
<div class="serverSpan">
<paper-icon-item>
<iron-icon icon="hardware:computer" item-icon="" class="serverLeft" />
<div class="serverRight">
<paper-icon-item>
<iron-icon icon="assessment" item-icon="" ui:field="serverAnalyze"/>
</paper-icon-item>
<paper-icon-item>
<iron-icon icon="apps" item-icon="" ui:field="serverApplications"/>
</paper-icon-item>
<paper-icon-item>
<iron-icon icon="file-upload" item-icon="" ui:field="serverLogUpload"/>
</paper-icon-item>
<paper-icon-item>
<iron-icon icon="more-horiz" item-icon="" ui:field="serverMore"/>
</paper-icon-item>
</div>
<div class="serverCenter">
<h4>
<span ui:field="serverName" class='serverName' />
</h4>
<paper-input ui:field="serverHostname" label="Hostname" readonly="true" />
<paper-input ui:field="serverDescription" label="Notes" readonly="true" />
<paper-input ui:field="serverFiles" label="File Location" readonly="true" />
</div>
</paper-icon-item>
</div>
<paper-dialog ui:field="editServerDialog"
entry-animation="fade-in-animation"
class="dialog" modal="">
<h2>Edit Server</h2>
<paper-input ui:field="serverNameInput" label="Name" required=""
auto-validate="" error-message="required input!"/>
<paper-input ui:field="serverHostInput" label="Hostname" required=""
auto-validate="" error-message="required input!"/>
<div class="textarea-container iron-autogrow-textarea">
<paper-textarea ui:field="descriptionInput" label="Notes"/>
</div>
<paper-input ui:field="serverFilesInput" label="File Location" required=""
auto-validate="" error-message="required input!"/>
<paper-dialog-scrollable>
<paper-input ui:field="serverNCpusInput" label="Number of CPUs" required=""
auto-validate="" error-message="required input!"/>
<paper-input ui:field="serverBenchmarkValueInput" label="Benchmark Value" required=""
auto-validate="" error-message="required input!"/>
<paper-input ui:field="serverBenchmarkInput" label="Benchmark Type" required=""
auto-validate="" error-message="required input!"/>
<paper-input ui:field="serverNDisksInput" label="Number of Disks" required=""
auto-validate="" error-message="required input!"/>
<paper-input ui:field="serverDiskPerformanceInput" label="Disk Performance" required=""
auto-validate="" error-message="required input!"/>
</paper-dialog-scrollable>

<div class="server-buttons">
<paper-button dialog-dismiss="">Cancel</paper-button>
<paper-button ui:field="confirmEditButton"
dialog-confirm="">OK</paper-button>
</div>
</paper-dialog>

<paper-dialog ui:field="errorDialog"
entry-animation="fade-in-animation"
class="dialog" modal="">
<h2>Service Error</h2>
<paper-input ui:field="errorMessage" label="Error" readonly="true" />

<div class="buttons">
<paper-button dialog-dismiss="">OK</paper-button>
</div>
</paper-dialog>
</div>
</ui:UiBinder>

Here's the scenario. I have a dialog with some information that looks fine. I want to add a lot more information to the dialog which will make it much too large to fit, so I put the extra information in a scrolling element. The problem is that the scrolling element doesn't scroll, and much of the dialog is inaccessible including the critical OK/Cancel inputs.

No scrolling:

With scrolling:

None of the examples I've been able to find show anything required to enable (or even control) scrolling, and there's nothing obvious to me in the code. I've tried everything I can think of with CSS with no useful results, but I'm hardly a CSS expert. The images shown use the stock CSS.

Binder file is attached.

Suggestions?

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